So the latest project I am working on is making conduit work with my iPhone, so I can sync my information in Linux. The project is pretty early on but it can already sync calendars and notes and even some of the data from your addressbook.
For more details check out this page:
http://matt.colyer.name/projects/iphone-linux/index.php?title=Conduit_Sync ing
Also if you want to help, join the mailing list.